TZR125 4DL (track bike)



  • @louis

    Interesting, most powerful stock from the factory DTR,s are the first 4 years of production. The 1988 models, code 3BN1 is the european full power model sold in France and Italy, code 3FW1 is the Japanese full power model these are all rated at 21.4 hp. The restricted 1988 code 3BP was also sold in France, 3DB1 in the UK.

    First of the full power flatslide carb 1989 models are codes 3PY2 for Italy and 3RM1 for France rated 22.9 hp. Restricted 1989 model code for France 3NC1, 3RN1 in the UK. Pretty much stay the same for a few years after.



  • I sort of understand what calum is saying. But personally, I'd run it by the numbers. I have no experience with rolling roads, Dynos and rebuilding engines etc... But I have plenty of experience with getting the maximum of performance out of computers. Now you can build yourself a nice rig and all and it can run your programs, engines, games or whatever absolutely fine. But if you don't tune your rig and set it up properly, then you're just losing some of the extra kick. And in which case, I then have to go and run the numbers 🙂

    If you're happy enough with a smooth ride, that's fine. If you want to push it to the limit then you'll need the numbers.

    https://www.youtube.com/watch?v=9D-QD_HIfjA



  • Sometimes thinks do not go as planed.
    When you belief in something that hard, and your are convinced that others have it wrong it will take you some time to conceder that they are right.

    It turns out that my own dyno was not set correct, re calculated my drum an that gave a massive drop in the measurements.
    Of course not very nice for me to know, as I thought I was going the right way.
    Thankfully don't have a company/ or a tuners name to keep high so a note on my site regarding the wrong setting should be enough.
    http://www.tzr3ma.com/dyno-correction.html

    But specially here I post a personal reaction, because they told me here over and over it is not making a +30HP and I did not belief it.😞

    So my apologies for that.

    The trough now is as followed.
    After the new settings the HP's where dropping faster than I could think off.
    But fair is fair, if this is what it should be, so be it.

    The results so far

    Stock the TZR125 (trackbike) has a 22,3HP at the rear wheel
    And with all the mod's i did so far (shortened exhaust, 6 degree more advance, changed carb rubber, open carb) it produced 24,8HP rear wheel.
    alt text

    Currently have changed the head to a O-ring conversion, but need to dyno it first.
    http://www.tzr3ma.com/head-to-o-ring-conversion.html
    It drops the squish from a 1,3 to a 1mm and combustion volume to a 11,2cc
    alt text
    Hope this will bring me a 1,5 a 2 HP and it end up around 27HP
    (not saying it will, but hope it does)

    After this like to do some other steps but that would probably bring more in the mid section than on peek power

    Will let you guys know

    Cheers
    Louis



  • That is sounding much more realistic! I'd rather underestimate the power and demolish others in that class, than overestimate and lag behind!

    Good for you for pushing on!



  • Will probably feel like a massive improvement in the real world compared to the small increases shown by the dyno 😉



  • That is sounding much more realistic! I'd rather underestimate the power and demolish others in that class, than overestimate and lag behind!

    You have a good point there.



  • Will probably feel like a massive improvement in the real world compared to the small increases shown by the dyno 😉

    Well standing on two feeds again that's for sure.
    The shown dyno curve, are a couple off same runs they always have a small tolerance

    Perhaps this is a better shown between stock and with the mod's
    alt text
    Orange curve is with ignition filter, that's way its so smooth.
    You can see the progress



  • I see its almost a year back sins my last post.

    Not much has changed, currently at 27,7Hp back wheel.
    alt text
    Hope to gain some more with the use off a more suitable exhaust (currently waiting on a test exhaust so I have a indication witch dimensions I need to make it)

    Engine changed a lot this can be read here.
    www.tzr3ma.com at section Tzr125 trackbike

    Currently mounting a zeel on my roadgoing bike, but have some problems with the setup.
    Hope to do some runs with here ones it is setup correct

    Cheers
    Louis



  • @louis A little archive you've got going on there. And you're seeing good returns on your modifications. More than I would expect.

    But I'm correct in thinking you're now running the SP barrel.



  • No its a 3MB cylinder only modified lifted port timing and two huge sub ports for the exhaust (bigger then the SP)
    alt text

    Problem now lies in the stock exhaust, this will need a update.
    Still want to beet the 30HP. But it turns out to be much tougher then I thought


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